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1、西南交通大學(xué)碩士研究生學(xué)位論文第1I頁的算法進(jìn)行故障測距計(jì)算。大量仿真表明本方案對理想混合輸電線路和接近實(shí)際拓?fù)涞幕旌陷旊娋€路的故障測距準(zhǔn)確率較高。由于EMD算法存在“混波’’，故障測距結(jié)果偶見誤差較大的情況，但經(jīng)理論分析知這一現(xiàn)象可借由人工巡線進(jìn)行彌補(bǔ)，不影響方法整體有效性。在輸電網(wǎng)的故障定位方面，論文首先研究簡單拓?fù)渚W(wǎng)絡(luò)提出了行波固有頻率主成分排序的故障定位方法，利用行波固有頻率主成分及其形成的行波路徑與輸電網(wǎng)故障位置之間的關(guān)系形成故障定位數(shù)據(jù)庫，構(gòu)建簡單拓?fù)漭旊娋W(wǎng)的故障定位判據(jù)及干擾排除方案，通過各測點(diǎn)得到的行波固有頻率主成分的排
2、序進(jìn)行故障區(qū)段的判定和故障測距計(jì)算。論文還討論了一般拓?fù)渚W(wǎng)絡(luò)的行波固有頻率主成分聯(lián)網(wǎng)故障定位方法，通過比較計(jì)算行波路徑和線路自身長度之間的關(guān)系，分析形成包含測量點(diǎn)失效情況的故障區(qū)段定位的判據(jù)，完成故障區(qū)段判定和故障測距計(jì)算。大量仿真表明，上述方法均能較好的實(shí)現(xiàn)輸電網(wǎng)的故障定位。總的說來，本論文最終形成了一個(gè)從高壓輸電線路(包括同桿雙回輸電線路)到架空．電纜混合輸電線路再到輸電網(wǎng)的故障定位測距框架，可望有一定的應(yīng)用前景。關(guān)鍵詞：故障測距；故障區(qū)段定位；固有頻率；固有頻率主成分頻率識別提??；EMD分解算法；同桿雙回輸電線路；架空．電纜混合輸
3、電線路；輸電網(wǎng)。AbstractItistheimportantperiodofacceleratingindustrializationandurbanizationatpresent,SOthedemandofelectricityhasmaintainedrapidgrowth．Withtheincreasingdislributionrangeofpowergrid，man-madedamagesoftenoccurredintheoperationandthepowersupplyequipmentiseasilyfailur
4、eforthelongtimerunning．Therefore，quicklyandaccuratelyfaultlocationisofenormoussocialandeconomicbenefits．Existingtime-domainfaultlocationmethodsusingtravellingwavehavekindsofdefects．Thefaultlocationmethodbasedonnaturalfrequencieswhichthispaperchoosecouldnotonlyprovideanew
5、solutiontoissuethefaultlocation,avoidtheinfluenceofpickingtravellingwavefront，accuratelycalculatethevelocityofthetravellingwave，butalsohasimportanttheoreticalandpracticalsignificance．However，thepowertransmissionlinesand鰣dwidelyusedsuchtypesoflinesasdouble-circuittransmis
6、sionlines，hybddoverhead．cabletransmissionlines．ItiSlittletofilldhowthefaultlocationmethodbasedonnaturalfrequenciesappliedtothesetypesoflines．Therefore，itisquitenecessarytodiscusshowtoputthemethodintothesetypesoftransmissionlinesandhowistheadaptabilityofit．Afterrespective
7、lyanalyzingmechanismsoffailuresingeneraltransmissionlines，double-circuittransmissionlines，hybridoverhead—cabletransmissionlinesandtransmissiongrid，thispaperdiscussesthefaultlocationmethodsforthesetransmissionlinesand鰣d．Intheaspectofpickingandspottingthedominantfrequencyo
8、fnaturalfrequenciesofthetravellingwave，thispaperintegratesthefunctionsofrecordingwaves，filteringwaves，p
